How much does a 5.00ct+ G SI1 lab grown round diamond cost?

As of October 2026, 5.00ct+ G SI1 lab grown round diamonds typically cost €754 EUR to €5,975 EUR, with a median price of €1,730 EUR. There are currently 100 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 round diamond?

About 51% of these diamonds are available at multiple retailers, with an average price spread of 85%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI1 Lab Grown Round

Quick answer

As of October 2026, there are 100 lab grown round diamonds with G color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €754 EUR to €5,975 EUR, with a median of €1,730 EUR. At least 26 retailers stock this exact specification, and 51% of the stones appear at more than one of them, with an average price spread of 85%. Half of all listings fall between €223 EUR and €500 EUR per carat. The same specification in natural form lists at a median of about €22,099 EUR per carat. Over the last 30 days the median price moved -16.4% and the number of listings moved +33.5%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Round lab grown stones in the index: 414 USD per carat, -5.0% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

100

Lowest Price

€526 EUR

Highest Price

€24,889 EUR

Average Price

€2,670 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

51.3%

Price Spread

85.3%

30-Day Price Trend

-16.4%

30-Day Supply Change

+33.5%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$363/ct

10th Percentile

$208

Median

$363

90th Percentile

$746

Score Distribution

177 diamonds scored across 4 quality tiers

Excellent

86 (48.6%)

Very Good

17 (9.6%)

Good

34 (19.2%)

Average

40 (22.6%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1